I've used both, and I kept the Pocket Chainsaw and gave the Sabre saw away. The Sabre worked okay, but the space in my pack was a factor. If you don't want to pack the handles with the Pocket Chainsaw, then it is easy enough to whack a pair from a limb or some such. Handles are a necessity for any serious sawing ops.
As far as hand powered saws go, you won't find a more compact, versatile or durable cutting tool that will cut wood as fast as one of these saws. If you don't like the case, they make an even smaller version that goes in a stuff sack.
I cut a lot of cordage with my Pocket Chainsaw. The only drawback I've ever experienced is once in a long while I will roll a loop in the chain going around a dead trunk and have to undo it before I can start cutting. The best way to use these saws is to lay the log or limb on the ground with one end propped up so you can get under it easily. Stand on the log(limb) facing the propped up end and loop the chain underneath, then just do the push me-pull ya routine and get a nice rhythm going and in about 5 seconds you will be through a two inch limb, about 15 seconds and you are through a 4 inch log (that's fir wood, oak or maple may take a little longer to get through).
Let me put it this way, if I were gonna do the nature thing and go hermitize up in the Alaskan wilderness and build me a log cabin using hand tools, this'd be at the top of the list for what I'd take with me. I even used it once to rip a 2' diameter log for campfire benches up at elk camp, once.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)